Sewing-machine-table frame and treadle



(N o Model.)

r J. E. DONOVA-N.,

SEWING MACHINE TABLE FRAMBAND TREADLE; No. 334,521. I Patenjied Jari. 19,'1886.

UN TED STATE-s "PAT ENT OFFICE.

JOHN E. DONOVAN, OF CINCINNATI, OHIO.

SEWING-MACHl NE-TABLE FRAME AND TREADLE.

sPBcrrIcA'rIoN forming part of Letters Patent No. 334,521, dated January 19, 1886.

Application filed December 9, 1,885. Serial No. 185,1e3. (No model.)

To all whom it may concern.-

Be it known that I, JOHN E. DONOVAN, a citizen of the United States, and aresident of Cincinnati, in the county ofHa'mil tOn and State of Ohio, have invented certain new and useful Improvements I in Sewing-Machine-Table, Frames and Treadles, of which the following is a specification.

My invention relates particularly to an improvement in sewing-machine frames, and the treadle-movement for the same.

Its object is, first, an improved means for mounting all the operative parts in the brace which connects and supports the legs upon which the table-top is mounted, so' that the driving-wheel treadle and pitman may be fitted up complete and truly aligned, so that friction of the parts in operation is reduced to a minimum; second, to provide a convenient meansfor detaching and securing the legs and brace together without requiring the parts to be drilled, thus making a more secure and firm support for the table-top and avoiding the labor and inconvenience of drilling the brace and legs for the bolts. which secure them together; third, to provide a brace which has the bearings for both the treadle and band -wheel integral with the brace, the bearings for the treadle being cast with the brace, so as to avoid, the trouble and expense of fitting; fourth, to provide a brace having the characteristics above set forth, and in addition thereto a dress-guard projecting forward from the brace, but integral with it, the said guard being provided with bosses to form a shaft-bearing, which bosses project forward fron the-brace, whereby the bearings may be readily drilled in line and thus insure a perfect fitfor the band-wheel shaft; fifth, to provide adjustable bearings, which may be used either with or without anti-friction ballbearings, as desired.

With these objects in View my invention consists in the peculiar arrangement and comblnation of parts,'which will be first fully described in connection with the accompanying drawings, and then particularly referred to and pointed out in the claims.

Referring to the drawings, in which like parts are indicated by similar reference-letters wherever they occur throughout the various views, Figure 1 is a front elevation of a sewfirmly locked together.

I ing-machine-table frame embodying my improvements. Fig. 2 is a central vertical section of the same, taken through line who of Fig. 1, and looking in the direction of the band-wheel.

taken through the crank-shaft bearings,showing the crankshaft in front elevation. Fig. 4: is a vertical sect-ion of the same taken through line y y of Fig. 3. Fig. 5 is a detail view in vertical section taken through line '0 o of Fig. 1, showing one of the knife-edge bearings for the treadle. Fig. 6 is a detail view in Vertical section taken at a right angle to the View shown in Fig. 5. Fig. 7 is aplan View in de tail of the device represented in Figs. 5 and 6. FigjSis a plan view in detail of one of the upper bosses upon the brace and legs. Fig. 9 is a detail view in edge elevation of the same. Fig. 10 is a detail view of the samein side ele- ,vation."

The legs A may be of any approved pattern. These are provided both at the top and bottom with bosses a, which are cut away on one side to match with the bosses b'upon the brace B, so that when the parts are fitted together and secured by screw-bolts a the parts are The bolt-holes in the legs A are cast in the legs and are of a tapering form, as shown in Figs. 8 and 10, and the bosses b are slotted, as shown at b, Fig. 9, to pass overthe neck of the bolt. The object of this arrangement is to avoid the labor of drilling holes in the bosses for the admission of the bolts after the frame is cast. The projecting lip onthe bosses b is on the same side of the boss as the slot b, so that when the parts are screwed together the brace is prevented from moving in one direction by the interlocking lips upon the boss, and in the opposite direction by the neck of the screw-bolt a. By this means all fitting of the legs and brace is avoided. The brace B has a forwardly-projecting loop, B, whichisintegral with the brace. The lower projecting portion of the loop serves as a dress-guard. Projecting forward from the loop B are two bosses, b and b, to furnish bearings for the crank-shaft 0, upon one end of which the band-wheel D is secured. The boss I) is bored entirely through, and the boss 11 is countersunk by the same drill and at the same operation, so that the bearings for the crank shaft 0 are sure to be truly in line. The end Fig. 3 is an enlarged vertical radial section of the boring-tool is so shaped as to leave in the back wall of the boss I) a conical depression to provide for the adjustment of the shaft 0 when the ball-bearings e are used, or to furnish conical bearings for the cone end of the shaft 0 when the ball-bearings e are omitted. A corresponding depression is also formed in the plug F, which snugly fits the bore in the boss N, for the same purpose. The plug F is held firmly in the desired position by a setscrew, f, which is tapped through the boss If, and bearing upon the plug F holds it firmly in position and admits of the adjustment of the plug for the purpose of adjusting the crankshaft bearings. The ends of the crank-shaft are tapered from the crank out to the base of the cone, so that only their cones are in frictional contact with the bearing-surfaces.

The lower cross-piece, G, of the brace 13 has V-shaped or knife-edge bearings g projecting up from it, upon which the treadle H rests and rocks, the under side of the treadle having depressions counter to the bearings, but large enough to prevent'frictional contact with them, except upon the top bearing-surfitces of the knife -edges. Cast with the brace are also bosses g, which are perforated and screw threaded to receive screws 9 which pass through slots h in the treadlc H. These screws are not tightened down upon the treadle, and are simply for the purpose of preventing its accidental displacement. The lower ends of the brace B has also slotted bosses 1) projecting back at right angles from the back of the brace to match onto bosses a 011 the lower cross-braces of the legs A. These bosses, like the upper bosses on the legs, have the openings for the screw-bolts cast in them in the same way and for the same purpose as the upper bosses.

The ball-bearings 0 may be of any desired number, depending, of course, upon the size of the balls. There should be a sufficient number of them used to prevent bunching together.

In fitting the parts together after the bosses Z) and b are drilled, the brace is placed upon edge, the loop side down, the balls 6 are placed in the boss b, the opposite end of the shaft 0 is first pushed back into the boss I), and then the shaft slipped back into its place, with the end resting in boss I)". The halls are then placed in boss b around the cone end of the shaft, the plug F pushed in against the balls and the screw f tightened up, after which the treadle is set upon its bearings, screws 9 screwed in place, and the pitman J connected.

It will be seen that there is very little fitting in the construction of my device, and the only part requiring adjustment is the bandwheel bearings.

hat I claim is- 1. In a sewing-machine stand, a cross-brace having supports for both the band-wheel and the treadle integral with the brace, and having bearings for the treadle cast with the brace.

2. In a sewing-machine-stand, a cross-brace having a dress-guard, and the supports for both the band-wheel and the treadle-bearings cast with the brace.

3. In a sewing-machine stand, the combination, substantially as hereinbefore set forth, of the legs A, having bosses a, having their faces cut away, as shown, and the brace B, having bosses Z), and cut away counter to the bosses upon the legs A, whereby the brace and legs may be firmly secured together.

4. In a sewing-machine stand, the dressguard B, integral with the brace, and having bosses cast with and projecting forward from the said guard and brace, so that the shaftbearings may be drilled in line, substantially as shown and described.

5. In a sewing-machine stand, a cross-brace having a dress-guard integral with the brace, and bearings for the band-wheel, consisting of bosses b" and If, integral with the dressguard, substantially as shown and described.

6. In a sewing-machine stand, the combination, substantially as specified, of the brace B, dress-guard B, and bosses b b", with the ball-bearings a, plug F, and adjusting-screw f, combined and arranged substantially as specified.

7. In a brace for sewing-machine stands, the knife-edge bearings 9, cast integral with the brace, and the treadle H, arranged to vibrate upon said knife-edge bearings, substantially as described.

8. A crank-shaft for band-wheels having cone ends, and ball-bearings for said ends, with means, such as shown, for adjusting the bearings with relation to each other, substantially as hereinbefore set forth.

9. In a sewing-machine stand, the combination, as specified, of the brace B, the dressguard B, and bosses I)? I)", cast integral with said brace, and the plug F and sct-screwf, the said plug and boss If having coincident conical depressions to admit of the adjustment of the band-wheel shaft in case of wear when ball-bearings are used, or to furnish bearings for the said shaft when the ball-bearings are dispensed with.

JOHN E. DONOVAN.

Witnesses:

O. W. MILns, GEo. J. llIURRAY. 

